Automatic stop for gramophones



O. 0. STORLE.

AUTOMATIC STOP FOR GRAMOPHONES.

APPLICATION FILED FEB. 7, I919.

Patented Apr. 19, 1921.

fltt rnegd.

7 ing machines in which record disks are used.

OLE -o. s'.ronnn, or maooivre. wasnrlveron. j

AUTOMATIC sror roa enAMorrionEs.

' Y Specification of Letters Patent. PQt t dA ji- 19 192 Application filed February-'7, 1919. SerialNo. 275,525.

To all whom it may concern Be it known that LOLn O. SToRLn, a citizen of the United States, residing at Tacoma, in the county of Pierce'and State of Washington,have invented certain new and useful Improvements in Automatic Stops for Gramophones, of which the following is a specification, reference being had to the accompanying drawing, forming a part thereof. 7 r I This invention relates to sound reproduchaving spiral grooves terminating at their inner ends in continuous circular grooves I of different radii according to the varying len ths of the spiral rooves of difi'erent recb .L t:

ords, and the tone arm carrying the stylus or tracing point which traverses the record grooves swings over the turn table transversely to the grooves.

The main objects of the invention are to automatically stop machines of this type at theends of records of different lengths; to avoid the'care and trouble involved in setting or adjusting the stop mechanism for records of different lengths,'and generally to simplify. and improve the construction and operation of devices of this class. I i

It consists in the construction, arrangement and combination of parts as hereinafter particularly described and pointed out in the claims. I p

In the accompanying drawing like characters designatethe same partsin the sev eral figures.

Figure 1. is a plan view of a brake and StOp mechanism embodying the invention as applied to a gramophone, parts of which are shown; Fig. 2 is a side elevation of the brake and stop mechanism, the top plate and turn table of the gramophone being shown in section; and Fig. 3 is a plan view similar to Fig. 1, of a modification ofthe brake, and stop mechanism.

Referring to Figs. 1 and 2, a designates the turn table having a downturned rim b,- c the top plate, which serves as a base plate or support for the brake. and stop mechanism, d the upper end of the turn tablespindle, and c a part ofthe tone. arm of'a gramophone or sound reproducing machine of a wellknown type.

A brake lever having three arms, f, g and it, like or similar to those used in machines 55,

of this class, is fulcrumed at the intersection of its armsson thepplate 0 by a stud or screw 5, and is provided at the end of its armf with a pad of rubber or other suitable elastic material adapted when .the

arranged when straightened, torhold the brake in off position, as shown in Fig. 1. The member 7a is extended beyond its knuckle or pivot connection with the member Z, and is formed with an upstanding projection m, which serves as a stop to limit the movement of the knuckle in one direct1on,or away from the spindle (Z, when the members are in approximate alinement with each other for locking and holding the brake lever in oif position, with the pad j out of engagement with the rim 7) of the turn table.

A spring n,-connected at one'end by ap'in or stud with-the plate a and at the opposite end with the memberZ adjacent to its pivot A pinion 0, having two teeth, is fixed on the spindle d between-the turn table a'and plate 0. A gear p, mounted on the plate 0 in position to mesh with the pinion 0, is formed or provided on oneslde with a wide pivot connections with the or laterally projecting tooth g; A spring friction washer r, interposed between the gear and the head of the screw stud s on .which the gear turns, prevents accidental turning or displacement of sald gear when neither of the teeth of the pinion o are in engagement therewith. An angular hooked trip arm 6 is pivotally connected at its elbow with the toggle. joint by the knuckle pin connecting the members of the joint with each other, and is movable at its hooked end into and out'of the path of the gear tooth g.

forked bracket m, fastened tothe plate a underneath the table 64, adjacent to the tone arm e... The wheel u is connected by a link y with an arm 2, attached to the tone arm 6. A drag arm 2, pivotally mounted on the upper end of the hub of the frictlon wheel e or otherwise, concentrically with the pivot of the friction wheel, and resting in trictional engagement on the rim 4) of the friction wheel, is connected by a link 3 with the trip arm 6 at the end opposite the hook.

In the operation of the brake and stop mechanism as shown in Figs. 1 and 2, assuming that the brake is released and applled and the parts of the mechanism are in positions indicated by dotted lines in Fig. 1, the tracing stylus carried by the tone arm engaging the circular groove indicated by the dotted line 4:, Fig. 1, at the end of a record,

when the tone arm 3 is swung outwardly for. I changing record disks or repeating a record,

the segmental friction wheel a will be correspondingly turned outward, its rim 4) sliding underneath the drag armQ and tending to swing the hooked end of the trip arm [1 toward and into the path of the gear tooth g. The inward movement of the tone arm neces sary to carry the stylus over a record disk and enter it in the outer turn of the spiral record groove, will correspondingly turn the friction wheel a clockwise underneath and in engagement with the drag arm 2, which will be carried therewith till the trip arm 25 is turned outwardly away from the path of the gear tooth 9 into inoperative position, as approximately indicated by dotted lines in Fig. 1. The brake being then thrown manually into release or oii position by means of the handle arm h, and the toggle joint thereby straightened to lock and hold the brake in that position, as shown by full lines in Fig. l, as the spindle (Z rotates, the teeth of the pinion 0 will engage with and intermittently turn the gear 9, and the friction wheel a V will be slowly advanced with the tone arm 6,

in a clockwise direction, and will carry the drag arm 2 with it till it is arrested and pushed back by engagement with the gear tooth g which extends above it, as shown-in Fig. 2.

- stylus traverses the spiral record groove and the friction wheel u is turned by the tone r arm 6 clockwise, but when the stylus enters the circular groove i at the end of the spiral record groove, the movement of the tone arm and of the friction wheel a connected there with will be arrestedatter the gear tooth g has pushed the drag arm back and turned the trip arm 25 into operative position in the path-ofsaid tooth, so that when said tooth is end of the trip arm, and its further rotation The drag arm will thus be alter nately swung toward and from the spindle by the first tooth of the pinion 0 will=bend the toggle joint sufficiently to release the brake'lever and permit the instant application of the brake by the spring a to the turntable, thereby stopping the machine. The second gear tooth of the pinion 9 turns the gear tooth g out of position to be reengaged byvthe hook at of the trip arm t, which has in the meantime been thrown by the action of the spring a in applying the brake andbending the toggle joint, out of the path oi said tooth, as indicated approximately by dotted lines in Fig. 1. The machine will thus be automatically stopped at the ends of records of dilierent lengths, without care or attention on the part of the operator, and without the necessity of setting or adjusting the stop mechanism for each record. I f; Referring to Fig. 3, showing a modificaion of-the mechanism, the toggle joint Z, is reversed and arranged to bend in-the opposite direction for releasing the brake lever and permitting the application of the brake, as indicated by dotted lines. The trip arm 6, pivotally connected at one end with the knuckle of the toggle joint, is formed at the other end with a shoulder'tor engagement with the tooth q, of the gear 29. The actuating connection of the segmental friction wheel a with thetone arm 6, consists oi? a bent arm 2', provided with a pivoted block 5, en aging a radial slot 6 in said wheel. A stop a, limits the movement of the drag arm 2 away from the spindle d by the friction wheel a, when the tone arm 3 is turned outwardly for changing records or repeating a record.

In other respects the mechanism shown in Fig. 3 is substantially like that shown in Fig. l in construction and operation.

Various changes other than; those shown and specifically mentioned,'may be made in the construction and arrangement or" parts or the brake and stop mechanism, without departure from the principle and scope of the invention as defined in the following claims. i v

I claim? 1. In an automatic stop for gramophones, the combination of a segment pinion on the turn table spindle, a gear arranged to mesh with said pinion and having a lateral projection adjacent its periphery, a brake lever, a toggle joint arranged when'straightened to hold the brake in oil position, a'spring tending to apply the brake; a trip arm pivotally connected with the tog le joint and movable into and out of the path of 'the lateral projection on said gear, an oscillatory friction member having an actuat lng connection with the tonearm, and pivoted drag arm engaging said friction member and connected with the trip arm,

said drag arm beingadapted to 'be'alter llO , to apply the brake; a segment pinion on nately swung toward and from the turn table spindle'by said friction member and the projection on said gear.

2. In an automatic stop for gramophones, the combination with a friction brake lever, of a toggle joint arranged to lock and hold the brake in off position; a spring tending the turn table spindle; a gear arranged to mesh with said pinion and having a laterally projecting tooth on one side; a trip arm pivotally connected with the toggle joint, movable into and out of the path of said tooth and adapted when engaged thereby to shift the knuckle of' the toggle joint and release the brake; an oscillatory friction wheel having an actuating connection with the tone arm; and a pivoted drag arm loosely engaged by said friction wheel and connected with the trip arm, said drag arm being adapted to be alternately swung toward and from the turntable spindle by the friction wheel and said gear tooth as the stylus transverses a record groove, and to carry the trip arm into and out of the path of said tooth until the stylus reaches the end of the record groove and the movement of the tone arm is thus arrested.

r 3. In an automatic stop for gramophones, the combination with a brake lever, of a toggle joint provided with a stop to hold the brake in off position, a spring tending to apply the brake and to bend the toggle joint, a segment pinion, on the turn table spindle, a gear arranged to mesh with said pinion and having a laterally pro ectlng tooth, a trip arm pivotally connected with the to e joint, a friction wheel having an actuat ifig connection with the tone arm ofthe gramophone, and a drag arm pivoted concentrically with the friction wheel in frictional engagement therewith-and connected with the trip arm, said drag arm being movable alternately by the friction wheel and projecting gear tooth toward and from thecenter of the gear and serving by its connection with the trip arm to alternately shift it into and out of the path of said tooth.

4. In an automatic stop for gramophones the combination with a brake lever, of a toggle joint adapted to hold the brake in off position, a spring tending to apply the brake and bend the toggle joint, a segment pivoted concentrically with the friction wheel in frictional engagement therewith and'connected with the trip'arm, said drag arm being movable into and out of the path of said gear tooth, and serving by its connecti'on with the trip arm to alternately shift it into and out of the path of said gear tooth.

5. In an automatic brake for gramo phones, the combination with a brake lever, of a toggle j'oint'adapted to hold the brake in off position, a spring tending to apply thebrake and to bend the toggle joint, a segment pinion on the turn table spindle having a plurality of teeth, a gear arranged to mesh with the pinion and having a laterally projecting tooth, an angular hooked trip arm pivotally connected with the'toggle joint and movable into and out of the path of said tooth, a friction wheel having an actuating connection with the tone arm of the gramophone, and afldrag arm pivoted concentrically with the friction wheel in frictional engagement therewith and con-f nected with the trip arm, said drag arm with the trip arm to bend the. toggle joint I and to release the brake leveriwhen the stylus reaches the end of the spiral record groove. 1 v i r i 6. In an automatic stop for gramophones the combination with a brake,'n1eans tending to apply the brake and means for releasably holding the brake in off position,

of a brake controlling member movable into and-out of operative position, a friction member connected and movable with the tone arm of the gramophone, a rotary memberactuated by the turn table spindle, a drag arm pivoted coaxially with the friction member and disposed radially thereto, said drag, arm being supported upon and in loose engagement with said friction member and adapted to be shifted thereby and by said rotary member and to shift the V brake controlling member alternately in opposite directions into and out of operative position while the stylus traverses a record groove and the tone arm movestoward the center ofthe record, and means actuated by the turn table spindle and adapted to e I shift the brake controlling member and release the brake'when the stylus reaches the end of the record groove and the'movement of the tone arm is arrested.

OLE o. STORLE.

Witness V NORMAN S'roRLE; 

